Deprecation of UIScreen.main in iOS 16

[amgleitman]

Introduction

As seen here, the class property UIScreen.main is being deprecated in iOS 16.

Details

We use this API in several places throughout React Native, and with added support for external monitors in iPadOS 16, we should consider migrating away from it. (Or at the very least, we should be aware of how this API behaves when external monitors are involved.)

As of right now, I don't know if there are any existing problems with multiple screens, although it may not necessarily be anything new thanks to existing split-screen functionality on current versions of iPadOS.

Discussion points

Apple recommends using the relevant UIWindowScene instance's screen property as a better way to get the current screen in its documentation. This solution requires iOS 13 or later, although we should probably still be able to use our current implementation as a fallback on older versions (since the current minimum is iOS 12.4, unless there are any plans to change this soon).

[gabimoncha]

Has anyone else tested builds on iOS 16, which is now in public beta?
I have a second machine which I want to install the new OS and test this out in August.